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Differences |
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| There is no game select screen |
| There are no game options |
| The right difficult switch selects between one and two player mode |
| The left difficulty switch freezes/unfreezes the battleship in place |
| The score counters are non-functional |
| There are more types of enemies than in the final version |
| The enemies never reach the second players shield |
| The sounds are very different (and quite nasty) |